keane



(No Mode1.) I '2 sheets-sheet 1.

J. KEANE.

SMOKE GONSUMING FURNAGE. No. 378,096. Patented Feb. Z1, 1888.

, SheetsfSh'e-et 2.`

(No Model.)

J. KEANE. SMOKE GONSUMING PUMA-0E.

*No.' 378,096. Patented Feb; 21,', A1888.-

UNITED STATES PATENT OEEICE".

JOHN KEANE, OF SAN FRANCISCO, CALIFORNIA.

AsivloKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 378,096. datedFebruaryzl, 1888.

Application filed October 6, 1887. Serial No. 251,667. (No model.) I

To all whom it may concern:

Be it known that I, JOHN KEANE, a citizen of the United States, residingin the city and county of San Francisco, and State of California, haveinvented certain new and useful Improvements in'Sxnoke-ConsumingFurnaces; and I do hereby declare that the following is a full, clear,and exact description of my said invention, reference being had to theaccompanying drawings, which form a part of this specification.

My invention relates to improvements in y steam-boiler furnaces in whichthe gases of combustion, after passing through the boiler lues or tubes,are returned to the fire-box and made to pass through the re inconjunction v with a supply of atmospheric air, which is introduced withthe smoke and gases in their passage to the nre-box, for the purpose ofsecuring complete combustion of the fuel and those products that passoff and are commonly lost in the smoke-stack.

The object of my said improvements is to remedy certain defects andimperfect features heretofore existing in devices or apparatus of thekind mentioned, and to secure complete combustion of the products fromthe fuel and the prevention of smoke.

The invention consists in the construction, arrangement, and combinationof parts, substantially as will be hereinafter'described and claimed.

Referring to the accompanying drawings, Figure 1 is a front View of astationary boilerfurnacebroken away to show a portion of the interiorconstruction. Fig. 2 is a side elevation taken from the right-hand sideof Fig. `l. Fig. 3 is a horizontal section taken through the brick-worksetting and below the boiler at about the line m x, Fig. 1, the ioor ofthe ashpit being broken away to show the chamber and the hollow space inthe bridge-wal1,which is a vertical extension of said chamber to the topof bridge-wall. Fig. 4 is a vertical section, taken longitudinallyonline am of Fig. 3, through the fire-box, the bridge-wall, ash-pit, andair-chamber below it. Figs. 5, 6, and 7 are detail views showing theconstruction of the'cast-iron plates and air-passages through them,which are set into the brick-work of the fire-box along the sides toform inclined and flaring apertures through the brick-work.

A represents the re-box, B the bridge-wall, and C the ash-pit, of aboiler-furnace.

AX is the front plate of the boiler; BX, the brick-work setting; CX, theboiler-breeching.

Dv is a space or chamber extending under the ash-pit, .preferably forits full area, and back to the bridge-wall, whence it terminates in orconnects directly with a hollow space, E, within the bridge-wall. At thesidesl also this air-space runs into air chambers or'spaces F, that areformed in the brick-work setting` and carried up above the-grate-surfacein-the fire-box to the height at least of the bridgewall at the back.

rlhe brick work and front of the boiler at one side are broken away inFig. 1 to show this chamber and the space under the ash-pit connectingwith it. The mouth of the ash-pit and the opening in the front of thespace D below the pit are vclosed by doors or plates W W'X after thefire is startedrand the fuel is well kindled. numerous air apertures,through which air from the chamber below is deliveredin jets or smallsstreams directly upward.

At Gr,v Figs. 1 and 2, is shown a double fan, mounted, for convenience,on the top of the boiler and driven by a belt or otherwise from anysuitable power at hand. This fan is of peculiar construction in beingdivided into two spaces by apartition, GX, and having two fans, vGr2 andG3, mounted on a single shaft, G, by which they are driven in the samedirection by one pulley, g5. ing at one compartment of the fan isconnected by the pipe H directly with the boiler-breeching and thedischarge apertures in the case,

and on the samev side of the dividing-partitionV is connected to a pipeor conductor, K, whichy is carried down the side of the brick-worksetting tov a point about on a level with the ashpit door, and is thencetaken throughthe brick-work and into the ash-pit, where it terminatesjust below the bottom of the grate.

Inthe top of the bridge wall are The central inlet-openj This side ofthe fan, acting by suction directly l on the space within the breeching,is made to draw the hot air and gases and other products from the endsof the boiler tubes orflues and roo d end to the lower or inner end.

to force such products into the ash-pit and up through the burning fuel,while the compartment in the fan on the opposite side of the partitionis caused to take in atmospheric air through thecentral inletsurroundingthe shaft and to deliver it both into the air-chamber F F andinto the pipe K, to mingle with and to increase the amount of oxygen inthe matter passing down through this conductor into the ash-pit.

The pipei L from the discharge-opening in the fan-case conducts the airinto the air-chamberin the one case, and the branch pipe LX, terminatingin the pipe K, carries and delivers a portion of this air from the faninto the gases and products drawn off from the breeching in the othercase. The temperature of this air may be raised in both cases bycarrying one pipe within the other, as shown in Figs. 1, 2, and 3. Thesides and walls of the air-chamber under the ash-pit will of coursecontribute considerably toward heating the air forced in by the fan G3,and especially when the front opening of the chamber is closed.

In the walls of the air-chambers F on the sides of the fire-boX areair-passages m,com posed of cast-iron plates that are arranged in rowsfrom the front back to the bridge-wall to deliver air in jets or streamslaterally across the fire-space at different levels. These passages areformed on both sides of the furnace, and are set with a downwardinclination to discharge the air against the fuel and flames. They arealso made of gradually-contracted area from the inner to the outer ordischarge ends,in order to spread the air-jets at the point ofdischarge. In forming these air-passages and apertures I cast a plate,M, in two halves, about the size of a brick in width,with a number ofinclined passages, as shown in Figs. 4t, 5, and G, and then in layingthe brick-work I set in a course one of these plates along the innerwalls of the setting that forms the sides of the fire-box. rIhe passagesare gradually contracted in area from the higher or outer The plates aremade of cast'iron, in halves or two parts, as shown, and when laid areset just back of the face of the brick-work, with the courses above andbeneath overhanging the ends of the plates, in order to protect theseends that are presented to the fire. It is not my intention, however, toclaim herein the construction shown iu Figs. 5, 6, and 7, and the sameis hereby disclaimed.

The opening S is made in the boiler-setting at the side and in line withthe top of the bridge-wall to afford facilities for cleaning off theperforated top. rlhis opening is made on a level with the top of thebridge-wall,and is closed by a door.

The lozenge-shaped bulk-head or partition seen at P, Figs. 3 and 4, isset in the middle of the air-chamber under the ash-pit for thepurpose ofspreading the incoming currents and bodies of air and directing themagainst the sides of the chamber; for equal distribution.

Both the colder air admitted from the outside through the front openingand the air forced in by the pipe L are acted on by this partition,which presents its angles to each inlet- The pipes H and K and thesmoke-stack are furnished with dampers for regulating the combustion, aswell as for controlling the operation of the apparatus. In thisconstruction the natural draft of the furnace is available at any timeby shutting off the pipes H and K and throwing open the smoke-stack; andthus at the time of starting the fires before the fan can be set inmotion the natural draft is not restricted and au abundant supply of airunder the grate can always be obtained through thc ash-pit opening, andalso through the airchamber below it. At such times, also, this chamberwill supply air above the fire through suitable bridge-wall aperturesand the inlets m in the sides of the fire-box, as the draft in thefurnace will produce circulation through these passages to some extentand draw air from the side chamber F. An abundant supply from theoutside into the chambers can be assured by having openings R in thefront of the brick-work, as shown in Figs. 1 and 3. After the fan isstarted the smoke stack damper is shut, andthe ash-pit and air-chamberopenings being closed, the draft and circulation of air to run thefurnace takes place continuously through the pipes K L LX,thefire-box,andboiler-tubesintothebreeching, from which the pipe H drawsoff the gases and such imperfectly-consumed matter as may pass over thebridge-wall.

Having thus fully described my invention, what I claim, and desire tosecureby Letters Patent, is Y l. rI he combination,withasteanrboilerfurnace, of the double suction-blower G, the exhaust-pipe H, leadingdirectly from the boilerbreeching to the blower, the conductor K,leading from the pressure side of the blower down to and terminating inthe ash-pit, the air-chambers D E F F, said chambers E F F provided withapertures delivering into the fire-box, the air-pipes L LX, and a damperin smoke-stack, all connected and arranged as described, for operationas set forth.

2. In a smoke-preventing apparatus for boilers, an air-chamber, D, underthe ash-pit,

opening into the atmosphere, with upright extensions into thebridge-wall and at the sides of the fire-chamber, and with aperturestherefrom delivering through the top of the bridge-wall and across thefirespace, in combination with a suction-blower having connectiondirectly with the boiler-breeching, the conductor K, leading from itspressure side into the ash-pit, and a suction-blower adapted to take airfrom the outside and to deliver it into the conductor K and theair-chamber belowthe ash-pit.

3. In a smokepreventing apparatus for steam-boilers, the doublesuction-blower G, exhaust-pipe H, adapted to draw directly from ICO theboiler-breechng, conductors K L LXQand air-chambers D E F, al'lconstructed, arranged,

, and operating substantially as described.

vided with apertures, a boi'ler-breeching having a smoke-stack withadamper and exhaustoutlet and pipe H, a suction-blower having aconductor, as K, from the pressure side delivering under thegratesurface ofthe furnace,

and a freshlair pipe adapted to deliver air into said conductor K from apressure-blower, r al1 constructed, arranged, and combined for jointoperation'substantially as specified.

In testimony that I. claim the foregoing I have hereunto set my hand andseal.

J OHN KEANE. [L. s;]

Witnesses:

. CHAs. E. KELLY,

C. W. SMITH.

